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- Millberg, Mikael, et al.
(author)
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Guaranteed bandwidth using looped containers in temporally disjoint networks within the Nostrum network on chip
- 2004
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In: Design, Automation And Test In Europe Conference And Exhibition, Vols 1 And 2, Proceedings. - LOS ALAMITOS, USA : IEEE COMPUTER SOC. - 0769520855 ; , s. 890-895
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Conference paper (peer-reviewed)abstract
- In today's emerging Network-on-Chips, there is a need for different traffic classes with different Quality-of-Service guarantees. Within our NoC architecture Nostrum, we have implemented a service of Guaranteed Bandwidth (GB), and latency, in addition to the already existing service of Best-Effort (BE) packet delivery. The guaranteed bandwidth is accessed via Virtual Circuits (VC). The vcs are implemented using a combination of two concepts that we call 'Looped Containers' and 'Temporally Disjoint Networks'. The Looped Containers are used to guarantee access to the network - independently of the current network load without dropping packets; and the TDNS are used in order to achieve several VCs, plus ordinary BE traffic, in the network. The TDNS are a consequence of the deflective routing policy used, and gives rise to an explicit time-division-multiplexing within the network. To prove our concept an HDL implementation has been synthesised and simulated. The cost in terms of additional hardware needed, as well as additional bandwidth is very low - less than 2 percent in both cases! Simulations showed that ordinary BE traffic is practically unaffected by the VCs.
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| 2. |
- Millberg, Mikael, et al.
(author)
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The Nostrum Backbone : a Communication Protocol Stack for Networks Chip
- 2004
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In: 17th International Conference On Vlsi Design, Proceedings - Design Methodologies For The Gigascale Era. - LOS ALAMITOS, USA : IEEE COMPUTER SOC. - 0769520723 ; , s. 693-696
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Conference paper (peer-reviewed)abstract
- We propose a communication protocol stack to be used in Nostrum, our Network on Chip (NoC) architecture. In order to aid the designer in the selection process of what parts of protocols, and their respective facilities, to include, a layered approach to communication is taken. A nomenclature for describing the individual layers' interfaces and service definitions of the layers in the protocol stack is suggested,and used. The concept includes support for best effort traffic packet delivery as well as support for guaranteed bandwidth traffic, using virtual circuits. Furthermore an application to NoC adapter is defined, as part of the Resource to Network Interface, and is used to communicate between the Nostrum protocol stack and the application. An industrial example has been implemented, simulated, and the results justifies the suggested layered approach.
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